Converting a lever-action may (and I say "may" since I have no personal experience in doing that) can be more involved, what with getting the right diameter magazine, right spring tension, right lifter, right feed, right extraction, and right ejection. I do know that just replacing old Marlin parts with new Marlin parts that were made 75 years apart is difficult enough.

The firing pin had to be changed out in this gun to change from rimfire to centerfire. As was said, someone on the internet says that they can make either of them for you. The .32 rimfires have not been made since about the 1980's, and that was a special run that quickly reached collectors item prices. The last time before that was probably the 1950's. The .32 Long Colt has not been made for 10 or more years and the .32 Short Colt went out of production 2-3 years ago. Both are hard to find and are expensive when they are found.

I have heard others say that it is easy to rechamber it to .32 S&W Long, but I have never actually read someone say that they did it. There may be other things that we don't know about with that conversion (I remember having a serious problem with replacing a 32-20 magazine on a Marlin because of minor differences between new and old production sizes -- or tolerances). If you decide to do this, let us know how it turns out.

http://www.gunauction.com/buy/13761512

I'm assuming it can be loaded with available .32 S&W dies and brass. I can't imagine a new Centerfire firing pin would be tough to make if one could t be located.